United Kingdom
- The British Library
- National Library of Scotland
- National Library of Wales
- BUBL - Bulletin Board for Libraries
- CILIP - Chartered Institute of Library and Information Professionals
- COPAC - National Online Public Access Catalogue
- CURL - The Consortium of University Research Libraries
- HERO UK Higher Education Library Catalogues
- UK Higher Education and Research libraries - (maintained by University of Exeter)
- UKOLN - The UK Office for Library and Information Networking
Ireland